I'm trying to add one year to the modification and creation dates to all files of a folder.

I found many examples to modify a whole date (not only the year).

How can I add one year to the creation/modification to all files in a folder  ?

Edit1: I'm on OS X

I'm trying to add one year to the modification and creation dates to all files of a folder.

I found many examples to modify a whole date (not only the year).

How can I add one year to the creation/modification to all files in a folder?

I'm on OS X.

I'm trying to add one year to the modification and creation dates to all files of a folder.

I found many examples to modify a whole date (not only the year).

How can I add one year to the creation/modification to all files in a folder ?

I'm trying to add one year to the modification and creation dates to all files of a folder.

I found many examples to modify a whole date (not only the year).

How can I add one year to the creation/modification to all files in a folder ?

Edit1: I'm on OS X